EP0702139A1 - Methode und Vorrichtung zur Unterdrückung von Längsschwankungen eines Kraftfahrzeugs - Google Patents

Methode und Vorrichtung zur Unterdrückung von Längsschwankungen eines Kraftfahrzeugs Download PDF

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Publication number
EP0702139A1
EP0702139A1 EP95401948A EP95401948A EP0702139A1 EP 0702139 A1 EP0702139 A1 EP 0702139A1 EP 95401948 A EP95401948 A EP 95401948A EP 95401948 A EP95401948 A EP 95401948A EP 0702139 A1 EP0702139 A1 EP 0702139A1
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EP
European Patent Office
Prior art keywords
vehicle
torque
variable
value
acceleration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95401948A
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English (en)
French (fr)
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EP0702139B1 (de
Inventor
Daniel Pignard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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Publication date
Application filed by Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0702139A1 publication Critical patent/EP0702139A1/de
Application granted granted Critical
Publication of EP0702139B1 publication Critical patent/EP0702139B1/de
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine

Definitions

  • the present invention relates to a method and a device for suppressing longitudinal oscillations of a motor vehicle, by controlling at least one parameter for controlling the engine torque, in response to a request for acceleration of the vehicle by the driver. .
  • This method has the disadvantage of only taking into account in the calculation of the correction to be applied to the engine control parameter, the oscillations of the engine speed, and of requiring significant calculation means.
  • the object of the invention is therefore to propose a solution which is simple to implement in order to solve the problems of longitudinal oscillations mentioned above.
  • the implementation of the method according to the invention requires the control of the engine torque delivered by the vehicle engine, by command of one or more engine control parameters.
  • these control parameters could be, for example, the ignition advance for internal combustion engines, the quantity of fuel admitted for internal combustion engines, or even the intensity or the voltage. power supply for electric motors for so-called electrically propelled vehicles.
  • control parameter (s) are chosen so that the engine torque is controlled almost instantaneously, that is to say for example at each half-turn of the crankshaft for heat engines.
  • the value of the engine torque must be determined periodically during vehicle operation.
  • This value of the engine torque can be measured or calculated in the case of a heat engine from an engine torque estimator model and from data representative at all times of measurement values of all or part of the following parameters: position of the vehicle acceleration control, engine speed, pressure in the engine intake manifolds, ignition advance, fuel richness, quantity of fuel admitted, temperature of air admitted, etc.
  • the engine torque is calculated from, among other things, the engine speed
  • the latter is determined for example every 10 milliseconds or every half-turn of the crankshaft for thermal engines.
  • the implementation of the method according to the invention requires knowledge as a function of time of the values of the instantaneous acceleration of the vehicle body.
  • measurements of the instantaneous acceleration of the vehicle body must be made periodically during the advancement of the vehicle with a frequency comparable to the frequency used for controlling the engine torque.
  • a requested acceleration value ⁇ d by the driver via the vehicle's acceleration pedal is measured in step 2.
  • a value of the engine speed noted R m of an engine M is measured in step 4 by means of an appropriate sensor placed on the shaft of the engine M.
  • step 6 the calculation of an optimum torque of the motor denoted C opt is carried out in step 6 from a conventional mapping process.
  • the instantaneous acceleration values of the body of the vehicle as a function of time using an appropriate sensor attached to the body of the vehicle.
  • variable V is an estimated value of the derivative of the instantaneous acceleration of the vehicle body at the time of calculation. This estimate is made by linear interpolation of the derivative from the last two measured values of the instantaneous acceleration of the vehicle body as a function of time.
  • this variable V is equal to the difference between the last two measured values of the instantaneous acceleration of the vehicle body divided by the time period separating the last two moments of measurement.
  • variable V is a value of the wave component of the instantaneous acceleration of the vehicle body calculated at an instant preceding the instant of development of the variable and separated from it by a quarter of the period of longitudinal oscillation to be removed from the vehicle.
  • This variable V is equal to the difference between the value of the instantaneous acceleration of the vehicle body measured at an instant preceding the instant of development of the variable and separated from it by a quarter period of the longitudinal oscillations at delete from the vehicle and the instantaneous acceleration value from the vehicle body calculated at the same time as if the engine were rigidly coupled to the vehicle without play and without elasticity.
  • step 12 using a proportionality coefficient ⁇ as a function of the intrinsic characteristics of the vehicle, a torque correction value ⁇ .V is calculated which is proportional to the variable V.
  • the proportionality coefficient noted ⁇ is calculated from the intrinsic characteristics of the vehicle considered at the time of calculation.
  • the coefficient ⁇ can be determined from the proper pulsation of the oscillations to be removed from the vehicle for each speed ratio, from a damping coefficient due to the tires, from a characteristic coefficient of the transmission stiffness for each ratio of speed, mass of the vehicle body, the moment of inertia of the engine torque, and the rotating elements of the transmission, as well as the ratio between the forward speed of the vehicle and the engine rotation speed .
  • the various parameters used for calculating the proportionality coefficient ⁇ are updated periodically and in particular whenever the intrinsic characteristic parameters of the vehicle change or are likely to change, as is the case, for example, after the vehicle has stopped.
  • step 14 we calculate from the optimum torque C opt and the correction value of the torque ⁇ .V a corrected value of the torque denoted C cor obtained by summing the optimum torque C opt and the correction value ⁇ .V.
  • a corrected engine torque control parameter denoted P, is calculated in step 16 from a conventional model linking the engine torque control parameter and the delivered torque. by this engine in response to the application of this parameter.
  • step 18 the motor M is piloted in step 18 as a function of the parameter P calculated in the previous step.
  • the method as described can be implemented cyclically during the entire operating time of the vehicle.
  • the instantaneous acceleration of the vehicle body no longer results from the action of the engine. It is almost zero and corresponds only to the action of the braking forces due to the different vehicle components and acceleration due to vehicle weight, which is a function of the gradient of the road.
  • the passage of the game is detected by detection of a break in the evolution of the acceleration curve of the vehicle, or by any other appropriate means, and the value of the derivative of the instantaneous acceleration of the vehicle body measured immediately is used for the implementation of the method before the start of the period corresponding to the passage of the game and which is made to increase in absolute value along a constant slope during the game.
  • This constant slope will have to pass the derivative of the instantaneous acceleration to a value between one and two times its value in 0.1 seconds.
  • Figure 2 is shown schematically a device for implementing the method according to the invention.
  • This comprises a set of conventional type sensors 20, 22, 24 connected to a computer 30 capable of processing the information received from the sensors according to programs stored in a memory 40 and as a function of characteristic parameters of the vehicle stored in a memory 42 .
  • This computer 30 The purpose of this computer 30 is to adjust the control parameter (s) P of the motor M and to store certain parameters from the sensors in a temporary memory 44, with a view to their subsequent reuse.
  • a corrected couple C cor which will be a linear extrapolation as a function of time of the corrected couple C cor before the game whose coefficient proportionality is between 0 and 0.33 of the derivative of the optimum torque C opt during the game.
  • the set of sensors includes at least one instant acceleration sensor 20 linked to the vehicle body, an engine speed sensor 22 and a sensor associated with the vehicle acceleration control 24 for measuring the driver's acceleration request .
  • the program memory 40 there are stored, for use by the computer 30, algorithms for conventional calculation of the optimum torque C opt as a function of the acceleration demand ⁇ d of the driver, algorithms for calculating the value of correction of the torque ⁇ .V to be applied to the optimum torque as a function of the instantaneous acceleration ⁇ c measured from the vehicle body over time, algorithms for calculating the corrected torque C cor from the optimum torque C opt and the correction value ⁇ .V, algorithms for calculating the values of the motor control parameter (s) P as a function of the values of the corrected torque C cor , and algorithms for calculating the value of the instantaneous acceleration of the body of the vehicle as if the engine were rigidly coupled to the vehicle without play and without elasticity.
  • Characteristic data of the vehicle, whether or not resulting from experimental measurements, and useful to the computer for determining the values of the motor control parameters, are stored in memory 42.
  • the computer 30 modifies in the memory 42 the values of the intrinsic characteristics having been updated using data from appropriate sensors.
  • the temporary memory 44 is used by the computer 30 to store data received from the sensors which are used at later times during the implementation of the method.
  • the computer commands at least one parameter P of control of the engine torque to suppress the longitudinal oscillations of the vehicle, resulting from the driver's acceleration requests, according to the different calculation algorithms described above by implementing the method according to the invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
EP19950401948 1994-09-14 1995-08-24 Methode und Vorrichtung zur Unterdrückung von Längsschwankungen eines Kraftfahrzeugs Expired - Lifetime EP0702139B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9410982 1994-09-14
FR9410982A FR2724433B1 (fr) 1994-09-14 1994-09-14 Procede et dispositif de suppression des oscillations longitudinales d'un vehicule automobile

Publications (2)

Publication Number Publication Date
EP0702139A1 true EP0702139A1 (de) 1996-03-20
EP0702139B1 EP0702139B1 (de) 1999-11-10

Family

ID=9466942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950401948 Expired - Lifetime EP0702139B1 (de) 1994-09-14 1995-08-24 Methode und Vorrichtung zur Unterdrückung von Längsschwankungen eines Kraftfahrzeugs

Country Status (3)

Country Link
EP (1) EP0702139B1 (de)
DE (1) DE69513256T2 (de)
FR (1) FR2724433B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10351047A1 (de) * 2003-10-31 2005-06-02 Bayerische Motoren Werke Ag Verfahren zum Steuern einer Antriebseinheit eines Kraftfahrzeugs
FR2920901B1 (fr) * 2007-09-10 2010-03-12 Peugeot Citroen Automobiles Sa Suppression des oscillations longitudinales d'un vehicule automobile

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042772A (en) * 1979-02-22 1980-09-24 Bosch Gmbh Robert Apparatus for damping oscillations of an ic engine
DE3831575A1 (de) * 1987-09-17 1989-04-06 Mazda Motor Motorregelungssystem zur schwingungsunterdrueckung einer fahrzeugkarosserie
EP0315171A2 (de) * 1987-11-05 1989-05-10 Hitachi, Ltd. Vorrichtung und Methode zum elektronischen Steuern eines Motors
EP0332119A2 (de) * 1988-03-09 1989-09-13 Hitachi, Ltd. Elektronisches Motor-Steuerungsverfahren
FR2681908A1 (fr) 1991-09-27 1993-04-02 Peugeot Procede de correction des parametres de controle d'un moteur a combustion interne et dispositif de mise en óoeuvre du procede.
FR2707347A1 (fr) * 1993-07-06 1995-01-13 Siemens Automotive Sa Procédé et dispositif de commande du régime d'un moteur à combustion interne en phase de ralenti.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042772A (en) * 1979-02-22 1980-09-24 Bosch Gmbh Robert Apparatus for damping oscillations of an ic engine
DE3831575A1 (de) * 1987-09-17 1989-04-06 Mazda Motor Motorregelungssystem zur schwingungsunterdrueckung einer fahrzeugkarosserie
EP0315171A2 (de) * 1987-11-05 1989-05-10 Hitachi, Ltd. Vorrichtung und Methode zum elektronischen Steuern eines Motors
EP0332119A2 (de) * 1988-03-09 1989-09-13 Hitachi, Ltd. Elektronisches Motor-Steuerungsverfahren
FR2681908A1 (fr) 1991-09-27 1993-04-02 Peugeot Procede de correction des parametres de controle d'un moteur a combustion interne et dispositif de mise en óoeuvre du procede.
FR2707347A1 (fr) * 1993-07-06 1995-01-13 Siemens Automotive Sa Procédé et dispositif de commande du régime d'un moteur à combustion interne en phase de ralenti.

Also Published As

Publication number Publication date
DE69513256T2 (de) 2000-03-23
FR2724433B1 (fr) 1997-01-17
DE69513256D1 (de) 1999-12-16
EP0702139B1 (de) 1999-11-10
FR2724433A1 (fr) 1996-03-15

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